Cone Area & Cone Extension

[Speed-Freak 0]

Excuse me,

 

When choosing a woofer, size seems be be everything. A 12" sub is better than a 10". A 6.5" woofer is better than a 4". I do understand that the larger the driver the easier it is for it to reproduce lower frequency sound. Can the measure could also be total displacement? Such as a long throw 10" driver can displace more air/space than a short throw 12" driver. I have seen this referred to as the "hit" or the physical impact the body feels.

How does driver extension affect the characteristics of sound and performance?

[frogcase2002 393]

Usually the enclosure has alot more to do with the frequencies produced than the size of the sub

[SpeakerBoy 64]

Idk i think what he's saying is say a single eighteen moved an inch, and a single twelve moved two and a half, with similar displacement and assuming equal cone mass, what's the difference in output? 

[Billy Jack 145]

Yes excursion does help but you also have motor strength. Subs like the sundown x are good at the lows cause of there huge Xmas and subs like the DD9500 series can hit incredible db numbers at higher frequency's without that much Xmas. 

[jcarter1885 995]

8 minutes ago, Billy Jack said:

Yes excursion does help but you also have motor strength. Subs like the sundown x are good at the lows cause of there huge Xmas and subs like the DD9500 series can hit incredible db numbers at higher frequency's without that much Xmas. 

Xmax

[Liro213 36]

3 hours ago, jcarter1885 said:

Xmax

Lol

[Billy Jack 145]

Lol yep spelled that wrong must have Christmas on the brain. 

[Randal Johnson 544]

LOL

[SpeakerBoy 64]

Nah, I've wondered this for a while. An eighteen and a twelve with equal displacement, motorforce, suspension compliance, moving mass, should have equivalent output yes? Or does the amount of air affected instantaneously factor in to the tone?

[///M5 2,833]

2 hours ago, SpeakerBoy said:

Nah, I've wondered this for a while. An eighteen and a twelve with equal displacement, motorforce, suspension compliance, moving mass, should have equivalent output yes? Or does the amount of air affected instantaneously factor in to the tone?

I don't understand the theoretical (and impossible) analogy.  Everything is related to the physical and electrical design of the driver and then the enclosure it is in.

No one answered the OP's question yet, because there isn't an answer that relates sound to any one characteristic.  He asked:

On 7/12/2016 at 5:22 PM, Speed-Freak said:

How does driver extension affect the characteristics of sound and performance?

which actually has a pretty easy answer.  The more travel you ask for in your driver the worse it will sound.  This is less pronounced in a sub as Doppler distortion and such aren't so disturbing at low frequencies.  But in essence the only general thing I can say about excursion is that the more you use the worse the response.

If he actually meant extension (ie, frequency range) and not excursion (which it doesn't look like if you read the whole paragraph) then you could also make the generalization that the more extension the less possible output or less quality output across the same range.  That is a more broad generalization though and taken out of context won't always apply.

[SpeakerBoy 64]

No, you answered exactly what I was trying to ask if travel effected tone. I may have used a few more words than needed lol